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Added Position command, changed number of columns to 3, and added result from toy example.
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Cassini
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Could you do something likeHow about

Boole@MapThread[Position[Boole@MapThread[(#1==#2)&,{epiDB[[1;;2]]epiDB[[1;;3]],epiExcel[[1;;2]]epiExcel[[1;;3]]},2],0] {{3,1}} 

And then look for the zeros?

Could you do something like

Boole@MapThread[(#1==#2)&,{epiDB[[1;;2]],epiExcel[[1;;2]]},2] 

And then look for the zeros?

How about

Position[Boole@MapThread[(#1==#2)&,{epiDB[[1;;3]],epiExcel[[1;;3]]},2],0] {{3,1}} 
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Cassini
  • 5.7k
  • 5
  • 29
  • 40

Could you do something like

Boole@MapThread[(#1==#2)&,{epiDB[[1;;2]],epiExcel[[1;;2]]},2] 

And then look for the zeros?